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Hi Gabriele, I appreciate the reply. Thankfully this issue was resolved about a month ago. If you are interested in the details, see: https://groups.cern.ch/group/atlas-simulation/Lists/Archive/Flat.aspx?RootFolder=%2Fgroup%2Fatlas-simulation%2FLists%2FArchive%2FGeometry%20and%20calculator%20implementation%20yielding%20expected%20results%20from%20simulation&FolderCTID=0x01200200ECB55EE754BB494DAEF0F9693C514D0B and https://groups.cern.ch/group/atlas-simulation/Lists/Archive/Flat.aspx?RootFolder=%2Fgroup%2Fatlas-simulation%2FLists%2FArchive%2FGeometry%20and%20calculator%20implementation%20yielding%20expected%20results%20from%20simulation%208385&FolderCTID=0x01200200ECB55EE754BB494DAEF0F9693C514D0B The last post on the latter link contains a brief overview of the original problem as well as the solution. Best, Vince. On Thu, 2015-06-25 at 07:40 -0700, Gabriele Cosmo wrote: > *** Discussion title: Geometry > > Hi Vince, > > overlaps should always be avoided, especially when these apply to > sensitive volumes, as it appears to be in your case. So, please > verify your geometry is free from overlaps using the provided tools! > The other thing which can be problematic when using Boolean subtractions, > is the presence of shared surfaces between the components being subtracted > which may lead to numerical instabilities, therefore better to avoid them by > properly composing the Boolean operation, if at all possible. > Hope it helps! > > Cheers, Gabriele > > -------------- > On Thu, 14 May 2015 17:46:23 GMT, Vince P. wrote: > > Hi, > > > > I am implementing a liquid argon calorimeter using GEANT4. Included are > > attachments of screenshots of my geometry. The calorimeter is the small > > portion to the left of the purple cylinder in attachments g4-ss1 and > > g4-ss3. > > > > Basically I have a mother volume in which I add two daughters, a solid > > cylinder of radius 40mm (c1, purple) and another hollow cylinder > > constructed using Pcons (c2, grey) with two radii, rmin=50mm and > > rmax=370mm. c1 passes through c2 as shown in attachments g4-ss1 and > > g4ss3. Now, c2 has the portion of the volume removed where c1 is > > inserted using a subtraction, as shown in attachments g4-ss2 and g4-ss4. > > > > This configuration results in weird energy deposits inside the > > calorimeter. Could this be due to an overlap between c1 and c2? When I > > remove c2 completely, I still get the same unexpected results, which > > makes me think the geometry is implemented fine. This has been causing > > me some grief for a while and so wanted an expert's opinion/advice. > > > > Thanks in advance, > > > > Vince. > > > > Attachment: > > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/05/14/10.42-19079-g4-ss1.png > > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/05/14/10.42-38003-g4-ss3.png > > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/05/14/10.42-42450-g4-ss2.png > > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/05/14/10.42-59318-g4-ss4.png > > > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/1417/1.html